§ Rhimdath ’Rushdown’ (RS:205) < N. rhib-, rhimp, rhimmo ’to flow like a [torrent?]’ (RIP-) + dath ’hole, pit’ (DAT-,DANT-) or rather ’steep fall, abyss’ (VT45:8)
This name is given directly under RIP- with the variant Rhibdath. See also Rhimdad, Rhimdath, Rhibdath ’Rushdown’ below (2.44).